Lust is a desire to have our way regardless of God's truth or another person's will. It is making a person an object to be used and not a person to relate to and learn to love. This ought not to be and we will see, causes very serious consequences.
It is truly eye-opening to see the strong statements in the Bible about the power of the tongue and the import of what we say on our lives. I suppose we should not be surprised, given the fact that God spoke the world into existence, and we, being made in His image, speak our world into existence. The most powerful words to shape our lives is our confession of faith in Jesus Christ as the Son of God and our personal Savior. This makes us a new creation in Christ, who comes to dwell in us.